By James Hibberd
Updated November 08, 2013 at 04:23 PM EST
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Glee brought out all the big diva guns Thursday night, with New Directions covering Katy Perry and Lady Gaga, plus Adam Lambert making his debut on the cast.

And yet: Ratings fell to tie the show’s all-time low, registering only 4 million viewers and a 1.5 rating in the adult demo. Glee has previously had this rating, but it was on the night before Thanksgiving last year, which in the TV ratings universe is a quasi-holiday. So this is the first time Glee has fallen this low during a non-holiday-week telecast.

Of course, baseball has pre-empted Glee in recent weeks, so the musical comedy is returning after a break. But its last episode was the highly rated Cory Monteith tribute, so last night’s episode was down 46 percent from that. Glee wasn’t helped by its lead-in: The X-Factor, was up from last week’s abysmally rated clip show, but fell to a new all-time low for a competition episode. Fox points out the episode was a “do-over” since Wednesday night’s episode had that on-screen graphics flub that messed up the voting.

Over on NBC, a special episode of The Voice swooped in to try and rescue the network’s 9 p.m. comedy block: Breathe! Breathe, damn you! It worked, at least for this week: Sean Saves the World jumped to a series high, The Michael J. Fox Show bounced to a five-week high and Parenthood hit a five-week high. Though an NFL game carried by NBC affiliate in one market could be boosting these numbers a bit. Triple-pumping The Voice this week to help the Thursday lineup impacted the musical competition series though — down 21 percent from Tuesday’s episode to rank as the show’s lowest-rated original telecast ever. Be careful NBC. Golden goose, etc.

ABC: Wonderland down 18 percent from its last original a couple weeks ago. Grey’s up 4 percent. Scandal down 7 percent to a season low. CBS: Big Bang season low, Millers and Crazy Ones both up since last week Big Bang was a repeat. Elementary down 6 percent. The CW’s Vampire Diaries jumped up 33 percent, while Reign held steady — you know, Reign‘s rating is pretty bad. But it’s freakishly consistent for a freshman drama.

NET/TIME/SHOW

ADULTS 18-49 RATING

TOTAL VIEWERS (+000)

FOX

8-9P

X-FACTOR-

1.2

3,636

9-10P

GLEE-

1.5

3,997

ABC

8-9P

ONCE-WONDERLAND-

0.9

3,536

9-10P

GREY ANATOMY-

2.7

8,552

10-11P

SCANDAL-

2.7

8,586

CBS

8:00P

BIG BANG-

4.8

16,588

8:30P

MILLERS-

2.7

10,680

9:00P

CRAZY ONES-

2.1

8,074

9:30P

TWO&HLF MN-

2.0

8,144

10-11P

ELEMENTARY-

1.7

8,757

NBC

8-9P

VOICE

S

2.7

10,233

9:00P

SEAN-WORLD-

1.7

5,583

9:30P

MJ FOX SHW-

1.3

4,243

10-11P

PARENTHOOD-

1.5

4,530

CW

8-9P

VAMPIRE DIARIES-

1.2

2,573

9-10P

REIGN-

0.6

1,696

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